Comparison

Convert Units Calculator vs UnitDeck

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Convert Units Calculator

Features
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Type a number once and read it in every unit that matters. The conversion you asked for lands front and centre, big enough to read from across the desk. The rest of the category is already worked out in the list below it - so when one answer raises the next question, it is on screen before you ask. Kilometres to miles, kg to lbs, Celsius to Fahrenheit, cups to grams, mpg to L/100km, GB to GiB, psi to bar. No account, no sign-in, no connection. CUPS TO GRAMS, PROPERLY A cup of flour and a cup of honey do not weigh the same, so the Cooking category asks which one. Choose from 26 ingredients - all-purpose and bread flour, granulated, brown and powdered sugar, butter, cocoa, oats, rice, honey, oils, peanut butter and the rest - and cups, tablespoons and teaspoons convert straight to grams and ounces. The weight per cup is shown right on screen, so you can check it against your own reference instead of trusting a black box. Recipes are written in fractions, so the app reads and writes them. Type "1 1/2" or "1Β½" cups and it converts 1.5; ask for cups back and 250 g of flour comes out as 2.083333 - and as "2 1/8", the nearest mark on a real measuring cup. A KEYPAD BUILT FOR NUMBERS The system keyboard covers half the screen and has no operators. This one stays put, has bigger keys, and adds + - x /. Type 12*3.5 straight into the value field and the converter works on the answer. Prefer your own keyboard? Turn the keypad off in Settings. FIND ANY UNIT Search every unit in the app from the header - type "psi" or "gibibyte" or "cups" and it takes you to the right category with the unit already selected. Ingredients are in there too: type "flour" and you land on the cooking screen with flour chosen. EVERYTHING IS LIVE - Results update on every keystroke. There is no Convert button. - Swap flips the direction in one tap. - Tap the big result, or any row in the list, to copy it. - Pin the conversions you reach for; they sit one tap away at the top. - The app reopens on the conversion you used last. - Commas welcome: "1,609.344" reads the same as 1609.344, and so does "1.609,344". - Feet-and-inches shorthand: type 5'11" when you are converting from feet. 19 CATEGORIES, 140 UNITS Length, weight, temperature, volume, area, speed, time, digital storage, energy, pressure, fuel economy, power, angle, frequency, force, torque, density, bandwidth and cooking. Including the ones other converters skip: gibibytes as well as gigabytes, UK gallons as well as US, L/100km as well as mpg, metric horsepower as well as mechanical, plus Rankine, Mach, knots, carats and nautical miles. WORKS OFFLINE, ALWAYS Every conversion is computed on your device from fixed, standard factors - a mile is 1,609.344 metres, a pound is 0.45359237 kilograms. No connection needed, ever. That is also why there is no currency tab: rates go stale, physics does not. DARK MODE Follows your system appearance, or lock it to light or dark in Settings. NOTHING TO SET UP No account, no sign-in, no onboarding tour. Open it, type, copy, done. FREE, WITH ONE OPTIONAL UPGRADE The app is free and shows a single banner ad. Convert Pro is a one-time purchase - not a subscription - that removes the ad, lifts the cap on pinned conversions, and lets you choose 2 to 10 decimal places. Every category and every unit stays free. Privacy policy: https://convert.chinesepowered.com/privacy.html

About

UnitDeck

Features
Read full description

UnitDeck is a fast unit converter and practical calculation toolbox built for real work. Choose your industry and UnitDeck places the conversions you use most on your Home screen. Convert common and specialist units, search by name or symbol, save favorites, keep conversion records, and add simple work notes without digging through long menus. BUILT AROUND YOUR WORK β€’ Industry profiles for trade, logistics, construction, textiles, manufacturing, furniture, electrical work, HVAC, agriculture, energy, marine work, automotive work, and more β€’ 121 conversion categories covering everyday and professional measurements β€’ 25 practical trade calculators for common field and desk workflows β€’ Search by unit name, symbol, or abbreviation β€’ Favorites, recents, saved conversions, notes, configurable precision, and inch fractions FAST AND PRIVATE β€’ Conversion inputs, saved records, and notes stay on your device β€’ No account required β€’ No advertising or cross-app tracking β€’ Core conversion tools work offline UNITDECK PRO The free version includes a useful set of common conversions, tools recommended for your first industry, and limited previews of professional categories. UnitDeck Pro unlocks the complete professional toolbox with one lifetime purchase. It is not a subscription and does not auto-renew. Conversion results are provided for general information, estimation, and workflow assistance. Verify safety-critical, contractual, engineering, medical, financial, or regulated work against applicable standards and qualified professional guidance.

Screenshots

Convert Units Calculator4 screens
UnitDeck4 screens

Verdict

The call

The clearest difference is in-app purchases: Convert Units Calculator at none against UnitDeck's 1. UnitDeck's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. UnitDeck sells 1 one-off in-app purchase. Convert Units Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

Convert Units Calculator ships an update every 3 months, UnitDeck every 2 weeks. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

Scorecard3 real differences Β· 3 level
Convert Units Calculator versus UnitDeck: the parameters behind the verdict, then further details
ParameterConvert Units CalculatorUnitDeck
PriceFreeFree
Update frequencyEvery 3 monthsEvery 2 weeks β€” better
AdsYesNo β€” better
In-app purchasesNo β€” betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.4 β€” better17.0
Further details β€” not scored
Size49 MB3 MB
Age rating4+4+
DeveloperNelson Laiε»ΊθΎ‰ 刘

In-app purchases

None

Convert Units Calculator

No in-app purchases

1 purchases

UnitDeck

One-time1
  • UnitDeck Pro – Lifetime$3.99

Questions

Is Convert Units Calculator free?
Convert Units Calculator is free to download, with no in-app purchases.
Is UnitDeck free?
UnitDeck is free to download, with in-app purchases available.
Do Convert Units Calculator or UnitDeck have ads?
Convert Units Calculator shows ads; UnitDeck does not.
Which is updated more often, Convert Units Calculator or UnitDeck?
Convert Units Calculator ships an update every 3 months, and UnitDeck every 2 weeks. Most recently, Convert Units Calculator was updated on October 3, 2026 and UnitDeck on October 2, 2026.

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